Castle is perhaps the only AMERICAN manufacturer of speed controls, but there are many over here in Europe that make quality products, like JETI, Schultze, MGM Compro and YGE to name a few so there's no lack of suitable equipment. And I have to laugh about the 2-3 min. flight time statement, obviously coming from someone with a total lack of EDF knowledge. That was the deal 8-10 years ago before LiPo batteries started to come onto the scene. My 30lb CARF MiG-15 on EDF power (converted Dynamax with 19lb installed thrust) easily gets 5-6 min flights, and that is with a power system as cheap as bying a used P80 turbine.